Nut lock



- patented @een l, lili@ nanna: a. narnia tranne, C" irren on rnrnsmunnra nur :to

n, or otnvnnarrn, onto, assisteren, nir manor .ann arnsnn assiem- .anna-nant, inc., or rnrnannnnnrn, rnnnsrnvnnre., a conrona- ,llpilioation filed September 2t, 19%. Serial filo. 015,385.

llhe invention relates to nutloclrs and more particularly to improvements in the nut loels oil my prior application for patent, .Serial No, 245,667, tiled Afanuar; 10,1928, wherein is set forth a nut having an annular groove onl one of is ends 4and surrounding ,the

central threaded horeoi" the nut, an lentrance groove being. also iorrned ln'the saine end oi the nut and leading from one side ot the nut to the annular groove, and a locking pin heing driven through said straight groove from the outer end thereof to enter t ie annular groove, and the locking pin being preierably made of solter material than the nut and the bolt upon 'which the nut is screwed, whereloy the pin is leent' as it enters the annular groove, and forms, between the surfaces of the 'groove and the bolt thread surfaces angular thereto, a wedge which acts to prevent unscrewing ot the nut on the bolt. llhese :Features are also hlound 1n the presV ent case which is a continuation ot the con1- .noon suhjectniatter contained in applicants ea'rlier copending application enumerated above,

ln niy aforesaid prior application, the grooves are provided in the inner end face oi the nut adjacent the head oi: the boltf which inner end tace is screwed against one ot the outerl opposed surfaces of thepieces' being held together by the nut and holt.

When ythe grooves are thus formed inthe inner end `lace of theV nut, some didiculties are encountered ininserting the locking pin, and in tightening the nut to the degree sometimes desired.

The object of the present improvement is to provide a more accessible nut having an annular groove in its outer end face, and surj rounding` the central threaded bore of the nut, and an entrance groove also being iorrnedin the outerv end lace ol the nut and leading :trom-one side ot the nut to the ann nular groove, whereby the nut maybe desired, and the locking pin may be more con veniently driven. through the entrance groove and into the annular groove tor tornaing a locking wedge as aforesaid.

Experiments and tests have demonstrated ,throughout the several views.

that nutloclrs. embodying the present im- I "proveniente are equally if not more eiiicient than the particular form set :t'orth in the together by a bolt and an improved hexagonal locking nut locked on the boltby one ol' the improved locking pins hereof; y Y A Fig. 2, a fragmentary end view ofthe bolt, locking nut, and locking pin in the direction of the arrows 2-2, Fig. l;

. Fig. 3, a lview similar to F ig. 2, illustrating a A,square locking nut embodying the present improvements and applied on a bolt and secured hy one oi the locking pins hereof; y

Fig. 4, a view similar to ll ig. 2, illustrating a modified forni of hexagonal lockingnut applied on a bolt and secured by one of the locking pins fand v Fig. 5, a perspective view illustrating a preferred form of locking pini v Similar numerals refer to similar parts A railroad bolt of usual construction is indicated at l in use for clamping together in a usual manner lish, plates 2 and 2 and a rail 3, the rail being` interposed between thelish plates and the'bolt passing through suitable registered rails.

apertures in the sh plates and An improved hexagonal loelring nut l emvbodying the present invention, is screwed on 'plate 2.

For securely locking the nut l at the de- -sired position on the threaded end 5 of the screwed upon the holt as tightly as may be youter end -lace 7' with an annular groove 8 bolt ll, the locking nut is provided in its normal to the axis of the bolt.

One or more axially straight entrance vso I grooves 10 are `also formed, in the outer end face 7 ofthe nut 4, and each entrance groove leads from a surface, lpreferably one of the outer sides 1l of the nut'to the annular groove 8 and connect. and communicate With the groove 8 at an angle substantially tangential thereto, and-with an axial depth substantially coinciding with the depth of the .annular groove.

Several ofthe entrance grooves 10 'are y provided leading from several of the side,

faces of the nut to the annular groove 8, so lthat where the nut is used in a location where itis only' accessible from one si de,'one vof the entrance vgrooves will always be in position for use. i

After the nut has beenscrewed 'pon the. bolt as aforesaid, a locking pin 12, which `is preferably made of slightly softer material than the nut and bolt, and which is preferably provided with atapered head 13, is driven into one ofthe entrance grooves 10,-so that the outer end of the shank 1 4 of the locking pin enters the 'annular groove 8 between-'the outer side surfaces thereof andthe exposed surfaces of the bolt threads, which are angular to the annular groove surfaces, whereby the end-of the shank 14 ofthe locking pin becomesan arcuate wedge in an arcuate or.

tion of the annular groove, as at 15, w ich securely locks the nut 4: inthe desired position on the bolt.

The end of the shankv 14' of the locking pin, v.

I as it enters between the -annular groove surfaces and the angular bolt thread surfaces, is

.- not 'only .curvedarcuately but is also. bent Asidewise in the directionof theboltaxis-and the extreme tip of the icking pin ful partially cuts across oneo'r more ofthe bolt threads.

Accordingly the vnut is so securely -locked upon the bolt, that unless it is removed in the properl manneras will hereinafter be set.

forth, the threads will'be partially 'stripped from the bolt.

In order to properly remove the nut from Vthe boltl afte'r it has been locked thereon as aforesaid, if the nut is not screwed as tightly as possible against the outer abutting surfaces of the pieces being secured by the nut.

and bolt, it is onlynecessary to vadvance the nut a ortion of a turn, and then to Withdrawtie pin frointhe grooves by grasping the head 13 of the pin by pliers or the like.

If the nut is screwed against the clamped pieces as tightly ,as possible, the nut may bc removed from the bolt bybacking off the nut a fraction of a turn, then by advancing the nut a fraction of a turn, whereby the wedge engagement of the locking pin is released anda the locking pin 4rnay be withdrawn. from the grooves as aforesaid. i f When the nut lock of the present invention issubject to vibration, as in railroad service, the fact that the end of the locking pin largroove. y or shank is bent or curved as aforesaid, prevents mere vibration of the nut and bolt from loosening the same.

In withdrawing 'the pin as aforesaid by pliers or the.like, the bend-or curve `in the outer end vof the locking pin isstraightened out bythe withdrawing force as the bent end passes from the annular groove to the enpossible by the forces set up by vibration. .I claim:- 1

v trance groove, and such a straightening is not l. In combination with afscrew threaded I bolt, a nut having ain-'annular groove in its outer end face about its central threaded bore,

an entrance groove extending from a side of the nut to said annular groove, and a lockin pin driven through the entrance groove an between surfaces 'of the annular groove and the' bolt threads.

, 2. In combination `with a screw threaded outer end face about its central threaded bore, anentrance'groove extending from aside of the nu't'to said-annular groove andtangential thereto, and 'a lockingpin driven through the entrancev groove and between surfaces of the annular groove and the bolt threads.

3. `.In combination with a screw threaded bolt,a nut having a central threaded bore and having an'annular groove in a face at one end bolt, a nut having an annular groove-in itsv` of the central'threaded bore,a' straight -groove extending from a side of the" nut only to lsaid annular groove, and'fa locking pin locatedin the straight groove and extending into the annular groove andin grip 'ing and wedging engagement'withthe threa ed bolt and annu- 4. In combinationwitha vscrew threaded bolt, a nuthaving 'a centralthreaded bore and having an annular groove in va'faoe at one;

end of the central threaded-bore, a straight to said annular groove and'ta'ngential theregroove extending froinf a side 4of the nut-only to, and a locking -pin 'located' in the straight groove and extending into the annular groove .and in' grippinga'nd wedgingengagement with the threaded bolt.

5. In conibinaion witha-screw threaded bolt, a nut having. a-central threaded bore and having an'annular groove in va face at onel end of the central threaded bore, a

straight groove extending `from a side of the nut only to said annular groove, and a lock'- ing pin located in the straight groove and extending into the annularggrooveand in vgripping and wedging engagement'with the threaded bolt', said locking pinhavingashoul-f dered head whereby a tool may be insertedbetween said head and nut AJfor removingthe j v ,j Jas d. lh combination with a screw' threaded" pin. *v

bolt, a nuthaving a central threaded bore andl havin an annular groove in one'face at one end ot the central threaded bore, an'entr'ance to Said annular groove, land a locking pin.

driven through said entrance groove and extending into the annular groove and in gripplng and Wedging engagement. With the threads of the bolt.

7. Inj co mbination with ascreW threaded bolt, a nut having a central threaded bore and having an arcuate groove in one face at one end oit'q the central threaded bore, the groove being in a plane normal to the axis of the bolt',- an entrance groove extending from a surface of the nut to said arcuate groove, and a locking. pin 'driven through said entrance groove and extending into the arcuate groove and in gripping and Wedging engagement with the `threads of the bolt.

8. Incornbination with a screw threaded bolt, a linut having a' central threaded bore and having an'arcuate groove in the-central A threaded bore, the groove being in a pla-ne normal to the axis of the bolt, an entrance groove extending from a surface of the nut to said arcuate groove, and a locking pin driven through said'entrance groove and eX- tendinginto the varcuate groove and in gri ping and Wedging engagement with t e i threads-of the bolt.

` extending from a' surface of the nut into the arcuate groove substantially tangential therel to,'the axial depth of the onegroove at its entrance intol the other groove coinciding with the depth of the otherl groove, whereby a locking pin driven through the entrance groove into'the arcuate groove will extend 1n gripping and Wedging engagement ywith the threads of the bolt.

In testimony that I claim the above, I have i hereunto subscribed my name.

tri

` FRANK J. KRABER` 

